Robert Adams case
Some background. He's New Mexico firearm collector and importer who had DHS pull a mega-raid on his house.
The Tenth Circuit just affirmed a District Court ruling suppressing the results of the search, on grounds of no probable cause. The claimed probable cause was that he bought some firearms in Canada, got the permit to import them, but only reported importing some of them. Yes... that and he'd occasionally gone to Canada, and on one occasion apparently drove back rather than flew. Yes...
UPDATE: well, this is interesting. Part of the probable cause claim related to Adams' supposed international travel, using data from DHS' Automated Targeting System. Turns out that that system (1) records airline reservations, and does not purge them if the person cancels the reservation and (2) has been exempted, at government request, from legal requirements that data be accurate and updated, since the government contended that even inaccurate and outdated "data" can give clues. And how much credence is a court supposed to place in data from that system?